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Efficacy and profitability of a mobile grinder system for biomass production in Korea
권형근,이학준,이준우,최성민 한국산림과학회 2016 Forest Science And Technology Vol.12 No.4
Forest biomass utilization is increasing in Korea, but on-site biomass operations have not been studied much. This study investigates the efficacy and profitability of a mobile grinder system that consists of a mobile tub-grinder, a grapple excavator, and a three-man crew. A time study was carried out to measure production time and to calculate the productivity of the system. The mobile grinder system ran 3 work cycles a day for total of 347.5 minutes. It was only productive for less than half of the 8 working hours a day (237.4 minutes, utilization rate of 49.4%). We estimated that the system produced 246.2 m3/day, which was 26% lower than the daily capacity reported by the grinder operators. This study found the system could make utilizing forest biomass profitable, although this depended on limited market information. The profitability of the system can be improved by increasing work cycles a day and decreasing organizational delays by better operation management. More research is needed to increase the on-site productivity of the system, and incorporate it and the actual price of wood chips to further assess the profitability of the system. The study results can be used as a justification for the grinder system, encouraging forest managers to adapt this relatively new operation.
로드킬의 발생현황과 원인조사를 통한 야생동물 치사감소방안에 대한 연구- 대전~서산 구간을 중심으로 -
권형근,최윤호,김명준,이준우 강원대학교 산림과학연구소 2008 Journal of Forest Science Vol.24 No.2
본 연구에서 충청남도의 국도 121 km를 대상으로 로드킬 현황조사를6회에 걸쳐 실시한 결과 총94개체가 발견되었다.그리고 도로의 구조에 따른 로드킬 발생현황은2차선 44회(1.13회/km), 3차선 1회(1.90회/km), 4차선 23회(0.35회/km)로 나타났다. 또한, 도로의 토지이용에 따른 로드킬 발생은 산지와 농경지의 경우 26회, 농경지와 농경지의 경우 25회, 산지와 산지의 경우 20회 등으로 나타났다. 아울러 야생동물의 로드킬을 방지하기 위해서는 도로의 구조 및 시설물 등에 대해 세심한 배려가 필요하다. This study conducted 6 times of roadkill investigations in national road 121 km (about 10%) of Chungcheongnam-do. As a result of the investigation, 94 individuals were found dead on the road. The roadkill statuses by construction of road were 44 times (1.13 times/km) at two traffic lanes, 1 time (1.90 times/km) at three lanes, and 23 times (0.35 times/km) at four traffic lanes. Also, land use on the frequency of roadkill were 26 times between mountain region and cultivated land, 25 times between cultivated land and cultivated land, and 20 times between mountain region and mountain region. So, particular attention is needed at the construction and facilities of road to reduce roadkill.
권형근,서정일,이준우 한국산림과학회 2019 한국산림과학회지 Vol.108 No.1
This study was conducted to evaluate the effect of the synthetic forest road network by calculating the optimal road density and layout of the forest road network in order to construct the systematic road network in the forested area. For this, five comparative routes were additionally planed and compared through evaluation indicators. As a result, the optimum road density of the study site was estimated to be 18.4 m/ha, and the synthetic forest road network was the best in the four indicators such as average skidding distance, standard deviation of skidding distance, development index, and circuity factor. In addition, the synthetic forest road network was comparable to the main road network by about 4 %p in the timber volume available and potential area size for logging, but the construction cost of the road was about 20 %p lower. It showed a synthetic forest road network was better in terms of economy. 이 연구는 체계적인 임내도로망의 구축을 위해 고규격 및 저규격의 임도를 포함하는 적정임도밀도를 산정한 후, 이를 토대로 구축한 복합임도망의 배치 효과를 5개의 비교임도망과 비교ㆍ평가하였다. 그 결과, 연구대상지의 적정임도밀 도는 약 18.4 m/ha로 산정되었으며, 평균집재거리, 집재거리표준편차, 개발지수, 임도 우회계수 등의 지표에서 복합임도망 이 가장 양호한 것으로 나타났다. 또한, 집재가능재적량과 집재가능면적에서 복합임도망은 간선임도망에 비해 약 4 %p 수 준으로 비슷하게 나타났지만, 임도개설비용은 약 20 %p가 낮게 나타나 경제적 측면에서도 양호한 것으로 나타났다.
권형근,이경철,홍진표,심윤진,성정원,윤희재,Hyeong keun Kweon,Kyeong Cheol Lee,Jin Pyo Hong,Yun Jin Shim,Jung Won Sung,Hui Jae Yun 국립한국농수산대학교 교육개발센터 2023 현장농업연구지 = Journal of practical agricultural resear Vol.25 No.1
This study was conducted to identify items that should be considered in order to increase user satisfaction in the Jayeonmadang project by analyzing the importance and satisfaction targeting Gochang Jayeonmadang users. As a result of analysis on the importance and satisfaction of Gochang Jayeonmadang users focusing on 20 items in 6 fields, Overall, it was analyzed that they were not satisfied as they were important. In order to increase user satisfaction of Gochang Jayeonmadang, maintenance such as 'cleanliness and hygiene', 'water quality', 'vegetation growth', and 'facility management' should be carefully reflected from the planning and design stage, and careful attention should be paid even after the project. In addition, emphasis should be placed on enhancing the user convenience, such as 'accessibility', 'space layout and utilization efficiency', and 'convenience of route'. And, when promoting the Jayeonmadang project, the purpose of the project should be actively promoted to local residents to raise the residents' awareness of the importance of biodiversity in the city.